1992 Illinois JETS TEAMS Regional Computer Fundamentals Test

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1 1. Subroutines a. are always compiled separately b. are never compiled separately c. may only use local variables which are passed as parameters d. may use both local and global variables e. always use global variables 2. Which of the following is only used as an input device? a. mouse b. diskette c. monitor d. printer e. modem 3. Software needs to be protected against a. fire, flood, lightening, and rockslides b. unauthorized access c. worms, viruses, and Trojan horses d. mistakes on the part of the user e. all of the above 4. A module is a. a separately named and addressable element of a software system. b. a collection of FORTRAN statements. c. a collection of C statements. d. a specific data structure used by a system. e. none of these. 5. Access control refers to a. keeping unauthorized users away from a system b. limited disk access time c. using unlisted telephone numbers d. keeping users away from each other e. keeping users away from the operating system 1

2 6. The principle of information hiding is best described as: a. The user should not have to be concerned with where in memory information is stored. b. Information within a module is inaccessible to other modules which have no need for such information. c. Management may keep information regarding specification changes from a programming team. d. It is hard to find specific detailed information in documentation that is separate from source code. e. Lack of communication within a programming team can result in lost data. 7. Structured programming consists of a. sequence, branching, looping b. testing, branching, looping c. sequence, gotos, branching, looping d. conditional branching, unconditional looping e. conditional sequence, branching, testing 8. a is an array with nn values. What does the following do? m := nn do n = 1 to nn a[n] := a[m] m := m - 1 end do a. reverse the order of the values in the array b. put the value of a[nn] in each member of the array c. set the values of the array to the integer values nn to 1 d. does not change any values in the array e. none of these 9. A prototype of a system is a. a trial version of a system under development b. an alternative version to the one requested by the user c. the source code of a fully developed system d. the object code of a fully developed system e. a complete system 10. When a computer program is executing, computer memory is being used to a. store machine language instructions b. store source languages instructions c. store data d. translate from source language to machine language e. both a and c 2

3 11. The following operations may be used with a stack. push x pop x add the value of x to the top of the stack; do not change x put the top value of the stack into x, remove from the stack After the following sequence of instructions, what are the values of a, b, c, d, and e? integer a, b, c, d, e a := 5; b := 10; c := 15; d := 20 push a push b push c push d pop e pop e pop e pop a a. a = 5, b = 10, c = 15, d = 20, e = 45 b. a = 5, b = 10, c = 15, d = 20, e = 10 c. a = 20, b = 10, c = 15, d = 20, e = 10 d. a = 20, b = 10, c = 15, d = 20, e = 15 e. a = 5, b = 0, c = 0, d = 0, e = 10 3

4 12. The Whatsit computer has exactly one register. The following is a description of a set of assembly language commands for it. Operation Description LOAD Load the register with the contents of the specified address. STORE Store the contents of the register in the specified address. ADD Add the contents of the specified address to the contents of the register SUB Subtract the contents of the specified address from the contents of the register ADDIM Add the specified value to the contents of the register SUBIM Subtract the specified value from the contents of the register PUSH put the following value onto the stack, do not change the register contents POP put the top stack value into the register, remove the value from the stack What sequence of instructions can be used to add the values A1h and B2h and store the result in address 10h? a. PUSH A1h ADDIM B2h STORE 10h b. LOAD A1h ADDIM B2h STORE 10h c. PUSH A1h POP ADDIM B2h STORE 10h d. PUSH A1h POP ADD B2h STORE 10h e. PUSH B2h PUSH A1h POP POP STORE 10h 4

5 13. Assume that a floppy disk storage system is characterized by the following specifications: Sectors/track 9 Rotation speed 240 rpm Tracks/side 40 Track to track seek 4 ms Sides 2 Worst case head seek 150 ms Bytes/sector 512 Average head seek 75 ms Sectors/cluster 2 Directory is on Track 0 After the heads are at the right track, what is the maximum rate in Kbytes/second at which data can be transferred? (1024 bytes = 1 Kbyte) a. 18 b. 36 c. 72 d. 144 e A 9-track tape system uses a directory block at the beginning of the tape. Interblock gaps are 1 inch long. Tape is read at 32 inches/second and can be rewound or fast forwarded at 400 inches/sec. A tape reel has 3600 feet of tape. Data for files is divided into blocks of 3072 bytes and encoded at 1024 bits/inch. Once a file is found, what is the average data transfer rate in Kbytes/second? (1024 bytes = 1 Kbyte) a b. 4 c. 24 d. 32 e File fragmentation in a PC-DOS file system a. causes system failure b. is a symptom of serious hardware failure in a disk system c. is caused by use of illegal DOS commands d. is caused by use of software not approved by IBM e. results from repeated deletion and creation of files 5

6 16. A monitor and video adapter that can address 64,000 different pixels can have which resolution? a. 64 x 100 b. 32 x 200 c. 320 x 200 d. 640 x 200 e. 320 x Good interactive software systems need error messages for the user. The advantage(s) of having error messages all in one place in the source code: a. the same message can be used for similar errors that occur in different places b. error messages can be modified easily c. error messages can easily be written into the user's manual or a help file d. all of these e. none of these, it really doesn't matter where the error messages are 18. The reason that systematic backup procedures are required is: a. to produce duplicate copies of software for other computers b. to limit or prevent loss of data in case of system failure c. to improve system performance d. to prevent virus attack e. all of the above 19. A directory on a disk in Drive A: of a PC microcomputer has only the files listed below. What PC-DOS command will result in a list of all files that don't begin with Q? TEST1.COM TEST2.COM TEST3.COM QUIZ1.463 QUIZ2.463 TRYIT.1 TRYIT.2 TRYIT.3 TRYIT.4 a. DIR b. DIR -Q*.* c. DIR TEST?.* d. DIR TRYIT.? e. DIR T*.* 6

7 20. In the Zigzag 1000 CPU, a word is 8 bits, and a fixed point unsigned number is stored with the fractional part in the lower 4 bits. The binary word to represent 10.5 decimal is: a b c d e The user interface a. may be written first as a rapid prototype. b. is the most unpredictable part of the system. c. should not surrender control to the operating system even when in the hands of a very unskilled user. d. all of these. e. none of these: the user should always enter correct data. 22. If you write a nifty program at home on your own computer and take it to work, use it on the job, and give copies to fellow employees, who does the program belong to? a. It's yours because you wrote it. b. It is yours if you filed a copyright application. c. It belongs to the company. d. It belongs to you and the fellow employees who used it. e. It depends on the company you work for. 23. The following sequence of PC-DOS commands TYPE CON > A:JUNK This is an example <CR> <Ctl/Z> a. copies a file called JUNK to drive A: b. sends a copy of A:JUNK to the printer c. creates a file on drive A: called JUNK d. sends input from the keyboard to a file called CON e. none of these - this is an invalid sequence 7

8 24. C4 hexadecimal = a binary b binary c. 403 octal d. 304 octal e. 197 decimal 1992 Illinois JETS TEAMS Regional Computer Fundamentals Test 25. What is the decimal value with sign and magnitude the 1 byte two's complement signed number ? a. 67 b. 68 c. -67 d. -68 e The values and in storage are to be added. The values and result are to be interpreted as two's complement binary values. The sum represented as a hexadecimal sign and magnitude is: a. 86h b. -02h c. -2Ah d. 7Ah e. none of these 27. Which of the following Boolean statements is true? (Note: A' = NOT A) a. AB + BC + AC = ABC b. A'B' + A'B + AB' = A' + B' c. AB'C + A'B'C = A + B + C d. A'B + A'B' = A e. A'B' + AB' = B decimal = a binary b. 15A hexadecimal c. 524 octal d. two of the above e. all of the above 8

9 29. The Whizbang 6000 computer has a clock speed of 8 MHz. What is the length of 1 clock cycle in nanoseconds? a b. 125 c d. 650 e A full adder a. is used to add 2 bits and a carry input b. can be implemented using 2 half adders and an AND gate c. both a. and b. d. requires 9 AND gates, 3 OR gates, and several inverters e. is used in the adding of 2 bits 9

10 Answer Key 1-d 2-a 3-e 4-a 5-a 6-b 7-a 8-e 9-a 10-e 11-b 12-c 13-a 14-c 15-e 16-c 17-d 18-b 19-e 20-e 21-d 22-c 23-c 24-d 25-d 26-b 27-b 28-c 29-b 30-a 10

1992 Illinois JETS TEAMS District Computer Fundamentals Test

1 1992 Illinois JETS TEAMS District Computer Fundamentals Test 1. The following pseudocode is an algorithm for finding the smallest of 3 numbers, x, y, and z. Where, if anywhere, is another "end if" needed?